Free SQL Courses
SQL is a foundational skill for anyone working with data. Whether you are targeting analyst, engineering, or product roles, these courses teach you to query, filter, aggregate, and join data across real databases.
Khan Academy — Intro to SQL
Interactive course covering SQL basics including creating tables, querying data, filtering with WHERE, and aggregation functions.
Codecademy — Learn SQL
Hands-on SQL course teaching SELECT, JOINs, aggregate functions, and subqueries through interactive exercises in the browser.
Stanford — Databases: Relational Databases and SQL (edX)
Stanford's self-paced course on relational database theory and practical SQL, covering normal forms, constraints, and complex queries.
SQLBolt — Interactive SQL Lessons
A series of short interactive lessons and exercises teaching SQL concepts from basic SELECT statements to advanced JOIN operations.
Mode Analytics — SQL Tutorial
Practical SQL tutorial focused on data analysis workflows. Covers window functions, subqueries, and performance optimization with real datasets.
Frequently Asked Questions
How long does it take to learn SQL?
Basic SQL (SELECT, WHERE, JOIN, GROUP BY) can be learned in 2-4 weeks. Intermediate skills like window functions, subqueries, and query optimization typically take another 4-8 weeks of practice with real datasets.
Is SQL still relevant in 2026?
SQL is more relevant than ever. It remains the universal language for relational databases, and nearly every data-driven role — analyst, engineer, product manager, or scientist — requires SQL proficiency. NoSQL databases have not replaced it.
What SQL dialect should I learn first?
Start with standard SQL (ANSI SQL). The core syntax works across PostgreSQL, MySQL, SQL Server, and SQLite. Once you understand the fundamentals, picking up dialect-specific features takes minimal effort.
Put these skills to work on your resume
Retold analyzes your resume against job descriptions and identifies missing keywords, skill gaps, and ATS issues — then rewrites your resume to match in 30 seconds.
Get started free